Cooling jacket structure

Abstract

A cooling jacket structure for cooling a stator of an electric drive, in particular in a motor vehicle, includes a tubular housing, in which a tubular stator carrier is accommodated and fixed in place on the inner side of the housing in such a manner that a gap that extends in the circumferential direction is formed in a section that extends in the axial direction between the inner side of the housing and the outer side of the stator carrier, as a cooling jacket through which a coolant can flow. The inner side of the housing and the outer side of the stator carrier are configured to be conical with reference to their axial direction, at least in the section, and wherein a stator is disposed on the inner side of the stator carrier.

1 . A cooling jacket structure for cooling of a stator ( 10 ) of an electric drive, in particular of the electric drive of a motor vehicle, comprising a tubular housing ( 12 ), in which a tubular stator carrier ( 14 ) is accommodated and fixed in place on the inner side ( 16 ) of the housing ( 12 ) in such a manner that a gap ( 22 ) that extends in the circumferential direction is formed in a section ( 18 ) that extends in the axial direction between the inner side ( 16 ) of the housing ( 12 ) and the outer side ( 20 ) of the stator carrier ( 14 ), as a cooling jacket ( 22 ) through which a coolant can flow, wherein the inner side ( 16 ) of the housing ( 12 ) and the outer side ( 20 ) of the stator carrier ( 14 ) are configured to be conical with reference to their axial direction, at least in the section ( 18 ), and wherein a stator ( 10 ) is disposed on the inner side ( 24 ) of the stator carrier ( 14 ). 
     
     
         2 . The cooling jacket structure according to  claim 1 , wherein the stator carrier ( 14 ) has circumferential cooling ribs ( 26 ) on its outer side ( 20 ), which ribs are distributed over the section ( 18 ), preferably uniformly. 
     
     
         3 . The cooling jacket structure according to  claim 1 , wherein the cooling ribs ( 26 ) are connected with one another in such a manner that they wind around the outer side ( 20 ) of the stator carrier ( 14 ) over the section ( 18 ), in helical shape, like a single cooling rib ( 26 ), so that a cooling channel in the manner of a spiral is formed over the section ( 18 ). 
     
     
         4 . The cooling jacket structure according to  claim 1 , wherein the stator carrier ( 14 ) is configured to be cylindrical on its inner side ( 24 ), in particular in the region connected with the stator ( 10 ). 
     
     
         5 . The cooling jacket structure according to  claim 1 , wherein the outer side ( 28 ) of the housing ( 12 ) is configured to be at least partially conical in the axial direction. 
     
     
         6 . The cooling jacket structure according to  claim 1 , wherein the housing ( 12 ) is cast in one piece. 
     
     
         7 . The cooling jacket structure according to  claim 1 , wherein the stator carrier ( 14 ) is cast in one piece. 
     
     
         8 . The cooling jacket structure according to  claim 1 , wherein at least one of the housing ( 12 ) and the stator carrier ( 14 ) comprises a light metal, preferably of an aluminum alloy. 
     
     
         9 . The cooling jacket structure according to  claim 1 , wherein at least one of the inner side ( 18 ) of the housing and the outer side ( 20 ) of the stator carrier is non-worked in the region of the section ( 18 ). 
     
     
         10 . The cooling jacket structure according to  claim 1 , wherein the cooling jacket ( 22 ) is configured in the form of a hollow truncated cone. 
     
     
         11 . The cooling jacket structure according to  claim 1 , wherein half the opening angle (ϕ) of the cooling jacket ( 22 ) in the form of a hollow truncated cone amounts to between 1° and 5°, preferably between 1° and 3°. 
     
     
         12 . The cooling jacket structure according to  claim 1 , wherein the stator carrier ( 14 ) has two contact surfaces ( 30 ,  32 ) that are spaced apart from one another in the axial direction and are oriented in the axial direction, which surfaces lie against corresponding contact surfaces of the inner side ( 16 ) of the housing ( 12 ) and fix the stator carrier ( 14 ) in place in the axial direction. 
     
     
         13 . The cooling jacket structure according to  claim 1 , wherein the stator carrier ( 14 ) has two fixation surfaces ( 34 ,  36 ) that are spaced apart from one another in the axial direction and are oriented in the radial direction, which surfaces lie against the inner side ( 16 ) of the housing ( 12 ) in the radial direction. 
     
     
         14 . The cooling jacket structure according to  claim 11 , wherein each fixation surface ( 34 ,  36 ) has an O-ring ( 40 ) assigned to it, which fixes the stator carrier ( 14 ) in place in the radial direction and/or seals it off.